If you were a specialist working for the National Security Agency, your main job would likely be
a. analyzing data from spy satellites.
b. working in the field to carry out covert operations.
c. analyzing and breaking coded messages.
d. electronic surveillance.
If you were a specialist working for the National Security Agency, your main job would likely be "d. electronic surveillance," since this is where a majority of the work is done--monitoring "every day" people.